858 	struct nullb_page *t_page;  in null_alloc_page()  local
860 	t_page = kmalloc(sizeof(struct nullb_page), GFP_NOIO);  in null_alloc_page()
861 	if (!t_page)  in null_alloc_page()
864 	t_page->page = alloc_pages(GFP_NOIO, 0);  in null_alloc_page()
865 	if (!t_page->page) {  in null_alloc_page()
866 		kfree(t_page);  in null_alloc_page()
870 	memset(t_page->bitmap, 0, sizeof(t_page->bitmap));  in null_alloc_page()
871 	return t_page;  in null_alloc_page()
874 static void null_free_page(struct nullb_page *t_page)  in null_free_page()  argument
876 	__set_bit(NULLB_PAGE_FREE, t_page->bitmap);  in null_free_page()
877 	if (test_bit(NULLB_PAGE_LOCK, t_page->bitmap))  in null_free_page()
879 	__free_page(t_page->page);  in null_free_page()
880 	kfree(t_page);  in null_free_page()
895 	struct nullb_page *t_page, *ret;  in null_free_sector()  local
902 	t_page = radix_tree_lookup(root, idx);  in null_free_sector()
903 	if (t_page) {  in null_free_sector()
904 		__clear_bit(sector_bit, t_page->bitmap);  in null_free_sector()
906 		if (null_page_empty(t_page)) {  in null_free_sector()
907 			ret = radix_tree_delete_item(root, idx, t_page);  in null_free_sector()
908 			WARN_ON(ret != t_page);  in null_free_sector()
917 	struct nullb_page *t_page, bool is_cache)  in null_radix_tree_insert()  argument
923 	if (radix_tree_insert(root, idx, t_page)) {  in null_radix_tree_insert()
924 		null_free_page(t_page);  in null_radix_tree_insert()
925 		t_page = radix_tree_lookup(root, idx);  in null_radix_tree_insert()
926 		WARN_ON(!t_page || t_page->page->private != idx);  in null_radix_tree_insert()
930 	return t_page;  in null_radix_tree_insert()
967 	struct nullb_page *t_page;  in __null_lookup_page()  local
974 	t_page = radix_tree_lookup(root, idx);  in __null_lookup_page()
975 	WARN_ON(t_page && t_page->page->private != idx);  in __null_lookup_page()
977 	if (t_page && (for_write || test_bit(sector_bit, t_page->bitmap)))  in __null_lookup_page()
978 		return t_page;  in __null_lookup_page()
1001 	struct nullb_page *t_page;  in null_insert_page()  local
1003 	t_page = null_lookup_page(nullb, sector, true, ignore_cache);  in null_insert_page()
1004 	if (t_page)  in null_insert_page()
1005 		return t_page;  in null_insert_page()
1009 	t_page = null_alloc_page();  in null_insert_page()
1010 	if (!t_page)  in null_insert_page()
1018 	t_page->page->private = idx;  in null_insert_page()
1019 	t_page = null_radix_tree_insert(nullb, idx, t_page, !ignore_cache);  in null_insert_page()
1022 	return t_page;  in null_insert_page()
1024 	null_free_page(t_page);  in null_insert_page()
1035 	struct nullb_page *t_page, *ret;  in null_flush_cache_page()  local
1040 	t_page = null_insert_page(nullb, idx << PAGE_SECTORS_SHIFT, true);  in null_flush_cache_page()
1045 		if (t_page && null_page_empty(t_page)) {  in null_flush_cache_page()
1047 				idx, t_page);  in null_flush_cache_page()
1048 			null_free_page(t_page);  in null_flush_cache_page()
1053 	if (!t_page)  in null_flush_cache_page()
1057 	dst = kmap_local_page(t_page->page);  in null_flush_cache_page()
1065 			__set_bit(i, t_page->bitmap);  in null_flush_cache_page()
1137 	struct nullb_page *t_page;  in copy_to_nullb()  local
1146 		t_page = null_insert_page(nullb, sector,  in copy_to_nullb()
1148 		if (!t_page)  in copy_to_nullb()
1151 		memcpy_page(t_page->page, offset, source, off + count, temp);  in copy_to_nullb()
1153 		__set_bit(sector & SECTOR_MASK, t_page->bitmap);  in copy_to_nullb()
1169 	struct nullb_page *t_page;  in copy_from_nullb()  local
1175 		t_page = null_lookup_page(nullb, sector, false,  in copy_from_nullb()
1178 		if (t_page)  in copy_from_nullb()
1179 			memcpy_page(dest, off + count, t_page->page, offset,  in copy_from_nullb()